js+canvas实现动态吃豆人效果
效果图：
代码如下：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>吃豆人V01</title>
</head>
<body>
<canvas id="canvas" width="500px" height="500px" style="border: 1px solid black"></canvas>
<script>
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
//TODO 面向对象方式解析
//TODO 1.创建吃豆人的对象模板
function Pacman(){
//TODO 属性
this.isOpen = true;//TODO 开关
this.start = 45*Math.PI/180;
this.end = 315*Math.PI/180;
//TODO 方法
//TODO 1.绘制方法
this.paint = function(){
//TODO 吃豆人的脸
context.beginPath();
context.arc(250,200,100,this.start,this.end);
context.lineTo(250,200);
context.closePath();
context.fillStyle = "yellow";
context.fill();
context.stroke();
//TODO 吃豆人的眼睛
context.beginPath();
context.arc(250,150,15,0,Math.PI*2);
context.fillStyle = "black";
context.fill();
//TODO 吃豆人的眼神
context.beginPath();
context.arc(255,145,5,0,Math.PI*2);
context.fillStyle = "white";
context.fill();
}
//TODO 2.控制开闭切换
this.open = function(){
if(this.isOpen){//TODO 开口
this.start = 45*Math.PI/180;
this.end = 315*Math.PI/180;
this.isOpen = false;
}else{//TODO 闭口
this.start = 0;
this.end = Math.PI*2;
this.isOpen = true;
}
}
}
//TODO 创建吃豆人的对象
var pacman = new Pacman();
//TODO 核心控制器
setInterval(function(){
context.clearRect(0,0,canvas.width,canvas.height);
pacman.paint();
pacman.open();
},200);
</script>
</body>
</html>